JP2003266939A - Optical information recording medium - Google Patents
Optical information recording mediumInfo
- Publication number
- JP2003266939A JP2003266939A JP2002069580A JP2002069580A JP2003266939A JP 2003266939 A JP2003266939 A JP 2003266939A JP 2002069580 A JP2002069580 A JP 2002069580A JP 2002069580 A JP2002069580 A JP 2002069580A JP 2003266939 A JP2003266939 A JP 2003266939A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- group
- optical information
- recording medium
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
- G11B7/246—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
- G11B7/249—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing organometallic compounds
- G11B7/2492—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing organometallic compounds neutral compounds
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25706—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing transition metal elements (Zn, Fe, Co, Ni, Pt)
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/2571—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing group 14 elements except carbon (Si, Ge, Sn, Pb)
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25715—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing oxygen
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25716—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing sulfur
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
- G11B7/245—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing a polymeric component
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- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2531—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising glass
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2532—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising metals
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
- G11B7/2534—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins polycarbonates [PC]
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- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
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- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
- G11B7/259—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on silver
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/21—Circular sheet or circular blank
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、光情報記録媒体に
関し、詳しくは、レーザ光の照射により情報の記録およ
び再生を行うことができる光情報記録媒体に関するもの
である。特に、波長３８０〜５００ｎｍの短波長レーザ
光の照射によって情報を記録するのに好適なヒートモー
ド型の光情報記録媒体に関するものである。
【０００２】
【従来の技術】従来から、レーザ光により一回限りの情
報の記録が可能な光情報記録媒体（光ディスク）が知ら
れている。この光ディスクは、追記型ＣＤ（所謂ＣＤ−
Ｒ）とも称され、その代表的な構造は、透明な円盤状基
板上に有機色素からなる記録層、金などの金属からなる
光反射層、さらに樹脂製の保護層がこの順に積層したも
のである。そしてこのＣＤ−Ｒへの情報の記録は、近赤
外域のレーザ光（通常は７８０ｎｍ付近の波長のレーザ
光）をＣＤ−Ｒに照射することにより行われ、記録層の
照射部分がその光を吸収して局所的に温度上昇し、物理
的あるいは化学的変化（例えば、ピットの生成）によっ
てその部分の光学的特性が変化することで情報が記録さ
れる。一方、情報の読み取り（再生）もまた記録用のレ
ーザ光と同じ波長のレーザ光をＣＤ−Ｒに照射すること
によって行われ、記録層の光学的特性が変化した部位
（記録部分）と変化していない部位（未記録部分）との
反射率の違いを検出することによって行われている。
【０００３】近年では、記録密度のより高い光情報記録
媒体が求められている。このような要望に対して、追記
型デジタル・ヴァーサタイル・ディスク（所謂ＤＶＤ−
Ｒ）と称される光ディスクが提案されている（例えば、
「日経ニューメディア」別冊「ＤＶＤ」、１９９５年発
行）。このＤＶＤ−Ｒは、照射されるレーザ光のトラッ
キングのための案内溝（プレグルーブ）がＣＤ−Ｒの半
分以下（０．７４〜０．８μｍ）という狭い溝幅で形成
された透明な円盤状基板上に、通常、有機色素を含有す
る記録層、光反射層、および保護層をこの順に積層した
ディスク２枚を互いの記録層を内側にして貼り合わせた
構造、あるいはこのディスクと同じ形状の円盤状保護基
板を記録層を内側にして貼り合わせた構造を有してい
る。そして、このＤＶＤ−Ｒへの情報の記録および再生
は、可視レーザ光（通常は、６３０ｎｍ〜６８０ｎｍの
範囲の波長のレーザ光）を照射することによって行われ
ており、ＣＤ−Ｒよりも高密度の記録が可能である。
【０００４】しかしながら、最近のインターネット等の
ネットワークやハイビジョンＴＶの急速な普及に加え、
ＨＤＴＶ（Ｈｉｇｈ Ｄｅｆｉｎｉｔｉｏｎ Ｔｅｌｅ
ｖｉｓｉｏｎ）の放映開始も間近にひかえている状況の
下、画像情報を安価簡便に記録することが可能で、か
つ、さらなる大容量の記録媒体が必要とされてきてい
る。上述のＤＶＤ−Ｒは現状においては大容量の記録媒
体としての役割を十分に果たしているが、さらなる大容
量化、高密度化の要求は高まる一方であり、これらの要
求に対応できる記録媒体の開発も必要である。このた
め、ＤＶＤ−Ｒよりも更に短波長の光で高密度の記録を
行なうことができ、より大容量の記録媒体の開発が進め
られている。
【０００５】例えば、特開平４−７４６９０号公報、特
開平７−３０４２５６号公報、特開平７−３０４２５７
号公報、特開平８−１２７１７４号公報、同１１−５３
７５８号公報、同１１−３３４２０４号公報、同１１−
３３４２０５号公報、同１１−３３４２０６号公報、同
１１−３３４２０７号公報、特開２０００−４３４２３
号公報、同２０００−１０８５１３号公報、同２０００
−１１３５０４号公報、同２０００−１４９３２０号公
報、同２０００−１５８８１８号公報、および同２００
０−２２８０２８号公報には、有機色素を含む記録層を
有する光情報記録媒体において、記録層側から光反射層
側に向けて波長５３０ｎｍ以下のレーザ光を照射するこ
とにより、情報の記録および再生を行う記録再生方法が
開示されている。これらの方法では、ポルフィリン化合
物、アゾ系色素、金属アゾ系色素、キノフタロン系色
素、トリメチンシアニン色素、ジシアノビニルフェニル
骨格色素、クマリン化合物、ナフタロシアニン化合物等
を含有する記録層を備えた光ディスクに、青色（波長４
３０ｎｍ、４８８ｎｍ）または青緑色（波長５１５ｎ
ｍ）のレーザ光を照射することにより情報の記録および
再生を行っている。
【０００６】また、現在使用されているＣＤ−Ｒシステ
ムとの互換性という観点から、２つの異なる波長領域の
レーザ光で記録および再生が可能な光情報記録媒体も提
案されている。例えば、特開２０００−１４１９００号
公報、同２０００−１５８８１６号公報、同２０００−
１８５４７１号公報、同２０００−２８９３４２号公
報、同２０００−３０９１６５号公報には、ＣＤ−Ｒに
用いられる色素とＤＶＤ−Ｒで用いられる色素とを混合
して用いることによって、７８０ｎｍ付近の近赤外域の
レーザ光、および６５０ｎｍ付近の可視レーザ光の何れ
のレーザ光によっても記録および再生が可能な光情報記
録媒体が提案されている。
【０００７】
【発明が解決しようとする課題】しかしながら、本発明
者の検討によれば、上記公報に記載された光ディスクで
は、波長３８０〜５００ｎｍの短波長レーザ光の照射に
より情報を記録する場合には、実用上必要とされる感度
を得ることができず、また、反射率や変調度などの他の
記録特性も満足できるレベルではなく、更に改良を要す
ることが判明した。特に、上記公報に記載された光ディ
スクでは、波長３８０〜５００ｎｍのレーザ光を照射し
た場合に記録特性が低下した。
【０００８】本発明は上記従来技術の問題点に鑑み成さ
れたものであり、本発明の目的は、波長３８０〜５００
ｎｍの短波長のレーザ光、とりわけ汎用性の高い波長４
０５ｎｍ近辺のレーザ光を照射して情報の高密度記録お
よび再生が可能であり、かつ優れた記録特性を有する光
情報記録媒体を提供することにある。
【０００９】
【課題を解決するための手段】上記目的を達成するため
に、本発明の光情報記録媒体は、基板上に波長３８０〜
５００ｎｍのレーザ光の照射によって情報の記録が可能
な記録層を有する光情報記録媒体であって、該記録層
は、下記一般式（Ｉ）で表される化合物（以下「本発明
における化合物」という場合がある。）を含有すること
を特徴とする。本発明における化合物は、３４０ｎｍ付
近に吸収帯を有している。この本発明における化合物を
記録層の記録材料として用いることで、波長が３８０〜
５００ｎｍの短波長のレーザーに対しても高い感度を示
し、かつ高い反射率、そして高い変調度を与える良好な
記録再生特性を備えた光情報記録媒体を得ることができ
る。
【００１０】
【化２】
［式中、Ｒ1乃至Ｒ6はそれぞれ独立して水素原子または
置換基を表し、Ｍは金属原子を表し、ｎは１以上の整数
を表す。］
【００１１】上記の一般式（Ｉ）において、Ｍを表す金
属が、銅、ニッケル、鉄、コバルト、パラジウム、マグ
ネシウム、アルミニウム、亜鉛、珪素、または希土類元
素であることが好ましい。また、置換基Ｒ1乃至Ｒ6が、
炭素原子数１乃至２０のアルキル基、炭素原子数６乃至
１４のアリール基、炭素原子数７乃至１５のアラルキル
基、炭素原子数１乃至１０のヘテロ環基、炭素原子数１
乃至２０のアルコキシ基、炭素原子数６乃至１４のアリ
ールオキシ基、炭素原子数２乃至２１のアシル基、炭素
原子数１乃至２０アルキルスルホニル基、炭素原子数６
乃至１４のアリールスルホニル基、炭素原子数１乃至２
５のカルバモイル基、炭素原子数０乃至３２のスルファ
モイル基、炭素原子数１乃至２０のアルコキシカルボニ
ル基、炭素原子数７乃至１５のアリールオキシカルボニ
ル基、炭素原子数２乃至２１のアシルアミノ基、アミノ
基、炭素原子数１乃至２０のスルホニルアルキルアミノ
基、炭素原子数６乃至１４のスルホニルアリールアミノ
基、スルホニルアミノ基、またはハロゲン原子であるこ
とが好ましい。また、ｎが１乃至４の整数であることが
好ましい。
【００１２】本発明の光情報記録媒体は、基板と記録層
との間に金属からなる光反射層を更に備えていることが
好ましく、記録層上に該記録層を保護するカバー層を更
に備えていることがより好ましい。また、基板の記録層
が設けられる側の表面には、トラックピッチ０．２〜
０．５μｍのプレグルーブが形成されていることが好ま
しい。
【００１３】
【発明の実施の形態】以下、本発明の光情報記録媒体の
実施の形態について詳細に説明する。
【００１４】本発明の光情報記録媒体は、基板上にレー
ザ光の照射によって情報の記録が可能な記録層を有する
光情報記録媒体であって、該記録層が下記一般式（Ｉ）
で表される化合物を含有することを特徴とする。
【００１５】
【化３】
［式中、Ｒ1乃至Ｒ6はそれぞれ独立して水素原子または
置換基を表し、Ｍは金属原子を表し、ｎは１以上の整数
を表す。］
【００１６】一般式（Ｉ）において、Ｒ1乃至Ｒ6で表さ
れる置換基の好ましい例としては、炭素原子数１乃至２
０のアルキル基、炭素原子数６乃至１４のアリール基、
炭素原子数７乃至１５のアラルキル基、炭素原子数１乃
至１０のヘテロ環基、炭素原子数１乃至２０のアルコキ
シ基、炭素原子数６乃至１４のアリールオキシ基、炭素
原子数２乃至２１のアシル基、炭素原子数１乃至２０ア
ルキルスルホニル基、炭素原子数６乃至１４のアリール
スルホニル基、炭素原子数１乃至２５のカルバモイル
基、炭素原子数０乃至３２のスルファモイル基、炭素原
子数１乃至２０のアルコキシカルボニル基、炭素原子数
７乃至１５のアリールオキシカルボニル基、炭素原子数
２乃至２１のアシルアミノ基、アミノ基、炭素原子数１
乃至２０のスルホニルアルキルアミノ基、炭素原子数６
乃至１４のスルホニルアリールアミノ基、スルホニルア
ミノ基、またはハロゲン原子を挙げることができる。Ｒ
1乃至Ｒ6として、好ましいものは、水素原子、アルキル
基、アリール基、アルコキシ基、アルコキシカルボニル
基、アルキルスルホニル基、アシルアミノ基、アミノ
基、スルホニルアミノ基、であり、特に好ましいもの
は、水素原子、アルキル基、アルコキシ基、アルコキシ
カルボニル基である。
【００１７】一般式（Ｉ）において、置換基Ｒ1乃至Ｒ6
は更に置換基を有していてもよく、該置換基の例として
は、以下に記載のものを挙げることができる。
【００１８】炭素原子数１〜２０の鎖状または環状のア
ルキル基（例えば、メチル、エチル、イソプロピル、シ
クロヘキシル）、炭素原子数６〜１８のアリール基（例
えば、フェニル、クロロフェニル、２，４−ジ−ｔ−ア
ミルフェニル、１−ナフチル）、炭素原子数７〜１８の
アラルキル基（例えば、ベンジル、アニシル）、炭素原
子数２〜２０のアルケニル基（例えば、ビニル、２−メ
チルビニル）、炭素原子数２〜２０のアルキニル基（例
えば、エチニル、２−メチルエチニル、２−フェニルエ
チニル）、ハロゲン原子（例えば、Ｆ、Ｃｌ、Ｂｒ、
Ｉ）、シアノ基、ヒドロキシル基、カルボキシル基、炭
素原子数２〜２０のアシル基（例えば、アセチル、ベン
ゾイル、サリチロイル、ピバロイル）、炭素原子数１〜
２０のアルコキシ基（例えば、メトキシ、ブトキシ、シ
クロヘキシルオキシ）、炭素原子数６〜２０のアリール
オキシ基（例えば、フェノキシ、１−ナフトキシ、トル
オイル）、炭素原子数１〜２０のアルキルチオ基（例え
ば、メチルチオ、ブチルチオ、ベンジルチオ、３−メト
キシプロピルチオ）、炭素原子数６〜２０のアリールチ
オ基（例えば、フェニルチオ、４−クロロフェニルチ
オ）、炭素原子数１〜２０のアルキルスルホニル基（例
えば、メタンスルホニル、ブタンスルホニル）、炭素原
子数６〜２０のアリールスルホニル基（例えば、ベンゼ
ンスルホニル、パラトルエンスルホニル）、炭素原子数
１〜１７のカルバモイル基（例えば、無置換のカルバモ
イル、メチルカルバモイル、エチルカルバモイル、ｎ−
ブチルカルバモイル、ジメチルカルバモイル）、炭素原
子数１〜１６のアミド基（例えば、アセトアミド、ベン
ズアミド）、炭素原子数２〜１０のアシルオキシ基（例
えば、アセトキシ、ベンゾイルオキシ）、炭素原子数２
〜１０のアルコキシカルボニル基（例えば、メトキシカ
ルボニル、エトキシカルボニル）、５もしくは６員のヘ
テロ環基（例えば、ピリジル、チエニル、フリル、チア
ゾリル、イミダゾリル、ピラゾリルなどの芳香族ヘテロ
環、ピロリジン環、ピペリジン環、モルホリン環、ピラ
ン環、チオピラン環、ジオキサン環、ジチオラン環など
のヘテロ環）、アミノ基、アシルアミノ基が挙げられ
る。
【００１９】一般式（Ｉ）において、置換基Ｒ1乃至Ｒ6
の置換基として好ましいものは、アルキル基、アリール
基、アルコキシ基、アルコキシカルボニル基、アミノ
基、アシルアミノ基、アルキルスルホニル基、スルホニ
ルアミノ基、であり、特に好ましいものは、アルコキシ
基、アルコキシカルボニル基、アミノ基、アルキル基で
ある。
【００２０】一般式（Ｉ）において、ｎは１乃至３が好
ましく、更に２乃至３が好ましく、特に３が好ましい。
ｎが２以上の整数のとき、複数個のＲは互いに同一でも
異なっていてもよいが、同一である場合が好ましい。ま
た、一般式（Ｉ）において、Ｍは金属原子を表し、中で
も銅、ニッケル、鉄、コバルト、パラジウム、マグネシ
ウム、アルミニウム、亜鉛、珪素、または希土類元素が
好ましい。ここで上記希土類元素とは、スカンジウム、
イットリウム、ランタン、セリウム、プラセオジム、ネ
オジム、プロメチウム、サマリウム、ユーロピウム、ガ
ドリニウム、テルビウム、ジスプロシウム、ホルミウ
ム、エルビウム、ツリウム、イッテルビウム、ルテチウ
ムの１７元素の総称であり、上記Ｍとしては、ユーロピ
ウム、亜鉛、銅、ニッケル、鉄、コバルト、パラジウム
が好ましい。
【００２１】本発明における化合物は、任意の位置で結
合して多量体を形成していてもよく、この場合の各単位
は互いに同一でも異なっていてもよく、またポリスチレ
ン、ポリメタクリレート、ポリビニルアルコール、セル
ロース等のポリマー鎖に結合していてもよい。
【００２２】本発明の光情報記録媒体に用いられる一般
式（Ｉ）で表される化合物は、特定の誘導体単独で使用
してもよく、また構造の異なったものを複数種混合して
用いてもよいが、単独で使用することが好ましい。尚、
本発明における化合物は、その合成時において不可避的
に置換基Ｒ1乃至Ｒ6の置換位置異性体を含む場合がある
が、これら置換位置異性体は互いに区別することなく同
一誘導体とみなすことができる。また、Ｒ1乃至Ｒ6の置
換基に異性体が含まれる場合も、これらを区別すること
なく、同一の本発明における化合物とみなすことができ
る。従って、構造が異なる場合とは、一般式（Ｉ）で説
明すると、置換基Ｒ1乃至Ｒ6の構成原子種または数が異
なる場合もしくはｎが異なる場合の何れかである。
【００２３】以下に、本発明でにおける化合物の好まし
い具体例（例示化合物１〜６）を下記に示すが、本発明
はこれらに限定されるものではない。
【００２４】
【化４】
【００２５】本発明の光情報記録媒体は、基板上に本発
明における化合物を含有する記録層を有していれば特に
制限はなく、種々の構成の光情報記録媒体に適用するこ
とができる。本発明の光情報記録媒体は、例えば一定の
トラックピッチのプレグルーブが形成された円盤状基板
上に光反射層、記録層、およびカバー層をこの順に有す
る構成とすることができる。以下、円盤状基板上に光反
射層、記録層、およびカバー層をこの順に有する光情報
記録媒体を例にとって、その製造工程に従い光情報記録
媒体の構成を詳細に説明する。
【００２６】基板としては、従来の光情報記録媒体の基
板材料として用いられている各種の材料を任意に選択し
て使用することができる。具体的には、ガラス；ポリカ
ーボネート、ポリメチルメタクリレート等のアクリル樹
脂；ポリ塩化ビニル、塩化ビニル共重合体等の塩化ビニ
ル系樹脂；エポキシ樹脂；アモルファスポリオレフィ
ン；ポリエステル；アルミニウム等の金属；等を挙げる
ことができ、所望によりこれらを併用してもよい。上記
材料の中では、耐湿性、寸法安定性および低価格等の点
から、ポリカーボネート、アモルファスポリオレフィン
が好ましく、ポリカーボネートが特に好ましい。また、
基板の厚さは、１．１±０．３ｍｍとすることが好まし
い。
【００２７】基板には、トラッキング用の案内溝または
アドレス信号等の情報を表わす凹凸（プレグルーブ）が
形成されている。より高い記録密度を達成するためにＣ
Ｄ−ＲやＤＶＤ−Ｒに比べて、より狭いトラックピッチ
のプレグルーブが形成された基板を用いることが好まし
い。プレグルーブのトラックピッチは、２００〜５００
ｎｍの範囲にすることが好ましく、さらに好ましくは、
２５０〜３５０ｎｍの範囲とする。また、プレグルーブ
の深さ（溝深さ）は、２０〜１５０ｎｍの範囲にするこ
とを必須とし、好ましくは、５０〜１２０ｎｍの範囲と
する。
【００２８】なお、後述する光反射層が設けられる場
合、光反射相側の基板表面には、平面性の改善、接着力
の向上の目的で、下塗層を形成することが好ましい。該
下塗層の材料としては、例えば、ポリメチルメタクリレ
ート、アクリル酸・メタクリル酸共重合体、スチレン・
無水マレイン酸共重合体、ポリビニルアルコール、Ｎ−
メチロールアクリルアミド、スチレン・ビニルトルエン
共重合体、クロルスルホン化ポリエチレン、ニトロセル
ロース、ポリ塩化ビニル、塩素化ポリオレフィン、ポリ
エステル、ポリイミド、酢酸ビニル・塩化ビニル共重合
体、エチレン・酢酸ビニル共重合体、ポリエチレン、ポ
リプロピレン、ポリカーボネート等の高分子物質；シラ
ンカップリング剤等の表面改質剤；を挙げることができ
る。下塗層は、上記材料を適当な溶剤に溶解または分散
して塗布液を調製した後、この塗布液をスピンコート、
ディップコート、エクストルージョンコート等の塗布法
により基板表面に塗布することにより形成することがで
きる。下塗層の層厚は、一般に０．００５〜２０μｍの
範囲にあり、好ましくは０．０１〜１０μｍの範囲であ
る。
【００２９】本発明の光情報記録媒体には光反射層を設
けるのが好ましい。光反射層には、レーザ光に対する反
射率が高い光反射性物質が用いられる。当該反射率は、
７０％以上であることが好ましい。反射率の高い光反射
性物質としては、Ｍｇ、Ｓｅ、Ｙ、Ｔｉ、Ｚｒ、Ｈｆ、
Ｖ、Ｎｂ、Ｔａ、Ｃｒ、Ｍｏ、Ｗ、Ｍｎ、Ｒｅ、Ｆｅ、
Ｃｏ、Ｎｉ、Ｒｕ、Ｒｈ、Ｐｄ、Ｉｒ、Ｐｔ、Ｃｕ、Ａ
ｇ、Ａｕ、Ｚｎ、Ｃｄ、Ａｌ、Ｇａ、Ｉｎ、Ｓｉ、Ｇ
ｅ、Ｔｅ、Ｐｂ、Ｐｏ、Ｓｎ、Ｂｉ等の金属および半金
属あるいはステンレス鋼を挙げることができる。これら
の光反射性物質は単独で用いてもよいし、あるいは二種
以上の組合せで、または合金として用いてもよい。これ
らのうちで好ましいものは、Ｃｒ、Ｎｉ、Ｐｔ、Ｃｕ、
Ａｇ、Ａｕ、Ａｌおよびステンレス鋼である。特に好ま
しくは、Ａｕ、Ａｇ、Ａｌあるいはこれらの合金であ
り、最も好ましくは、Ａｕ、Ａｇあるいはこれらの合金
である。
【００３０】光反射層は、例えば、上記光反射性物質を
蒸着、スパッタリングまたはイオンプレーティングする
ことにより基板上に形成することができる。光反射層の
層厚は、一般的には１０〜３００ｎｍの範囲とし、５０
〜２００ｎｍの範囲とすることが好ましい。
【００３１】記録層の形成は、蒸着、スパッタリング、
ＣＶＤまたは溶剤塗布等の方法によって行うことができ
るが、溶剤塗布または蒸着が好ましい。溶剤塗布により
記録層を形成する場合、前記本発明における化合物の
他、更に所望によりクエンチャー、結合剤などを溶剤に
溶解して塗布液を調製し、次いでこの塗布液を基板（光
反射層を設ける場合には光反射層）表面に塗布して塗膜
を形成した後、形成した塗布膜を乾燥して形成すること
ができる。塗布液の溶剤としては、酢酸ブチル、乳酸エ
チル、セロソルブアセテートなどのエステル；メチルエ
チルケトン、シクロヘキサノン、メチルイソブチルケト
ンなどのケトン；ジクロルメタン、１，２−ジクロルエ
タン、クロロホルムなどの塩素化炭化水素；ジメチルホ
ルムアミドなどのアミド；メチルシクロヘキサンなどの
炭化水素；ジブチルエーテル、ジエチルエーテル、テト
ラヒドロフラン、ジオキサンなどのエーテル；エタノー
ル、ｎ−プロパノール、イソプロパノール、ｎ−ブタノ
ール、ジアセトンアルコールなどのアルコール；２，
２，３，３−テトラフルオロプロパノールなどのフッ素
系溶剤；エチレングリコールモノメチルエーテル、エチ
レングリコールモノエチルエーテル、プロピレングリコ
ールモノメチルエーテルなどのグリコールエーテル類な
どを挙げることができる。上記溶剤は使用する色素の溶
解性を考慮して単独で、あるいは二種以上を組み合わせ
て使用することができる。塗布液中にはさらに酸化防止
剤、ＵＶ吸収剤、可塑剤、潤滑剤など各種の添加剤を目
的に応じて添加してもよい。
【００３２】結合剤を使用する場合に、結合剤の例とし
ては、ゼラチン、セルロース誘導体、デキストラン、ロ
ジン、ゴムなどの天然有機高分子物質；およびポリエチ
レン、ポリプロピレン、ポリスチレン、ポリイソブチレ
ン等の炭化水素系樹脂、ポリ塩化ビニル、ポリ塩化ビニ
リデン、ポリ塩化ビニル・ポリ酢酸ビニル共重合体等の
ビニル系樹脂、ポリアクリル酸メチル、ポリメタクリル
酸メチル等のアクリル樹脂、ポリビニルアルコール、塩
素化ポリエチレン、エポキシ樹脂、ブチラール樹脂、ゴ
ム誘導体、フェノール・ホルムアルデヒド樹脂等の熱硬
化性樹脂の初期縮合物などの合成有機高分子を挙げるこ
とができる。記録層の材料として結合剤を併用する場合
に、結合剤の使用量は、一般に色素（本発明における化
合物）に対して０．０１倍量〜５０倍量（質量比）の範
囲にあり、好ましくは０．１倍量〜５倍量（質量比）の
範囲にある。このようにして調製される塗布液中の色素
の濃度は、一般に０．０１〜１０質量％の範囲にあり、
好ましくは０．１〜５質量％の範囲にある。
【００３３】塗布方法としては、スプレー法、スピンコ
ート法、ディップ法、ロールコート法、ブレードコート
法、ドクターロール法、スクリーン印刷法などを挙げる
ことができる。塗布温度としては２３〜５０℃の範囲内
であれば特に問題はないが、好ましくは２４〜４０℃で
あり、２５〜３７℃が更に好ましい。また、上記蒸着
は、誘電加熱で分解温度以下であればよく、好ましくは
４００℃以下で真空度が１０-3ｍＰａ以下、さらに好ま
しくは３００℃以下で真空度が１０-4ｍＰａ以下であ
る。記録層は単層でも重層でもよい。記録層の層厚は一
般に２０〜５００ｎｍの範囲にあり、好ましくは３０〜
３００ｎｍの範囲にあり、より好ましくは５０〜１００
ｎｍの範囲にある。
【００３４】記録層には、記録層の耐光性を向上させる
ために、種々の褪色防止剤を含有させることができる。
褪色防止剤としては、一般的に一重項酸素クエンチャー
が用いられる。一重項酸素クエンチャーとしては、既に
公知の特許明細書等の刊行物に記載のものを利用するこ
とができる。その具体例としては、特開昭５８−１７５
６９３号、同５９−８１１９４号、同６０−１８３８７
号、同６０−１９５８６号、同６０−１９５８７号、同
６０−３５０５４号、同６０−３６１９０号、同６０−
３６１９１号、同６０−４４５５４号、同６０−４４５
５５号、同６０−４４３８９号、同６０−４４３９０
号、同６０−５４８９２号、同６０−４７０６９号、同
６３−２０９９９５号、特開平４−２５４９２号、特公
平１−３８６８０号、および同６−２６０２８号等の各
公報、ドイツ特許３５０３９９号明細書、そして日本化
学会誌１９９２年１０月号第１１４１頁などに記載のも
のを挙げることができる。好ましい一重項酸素クエンチ
ャーの例としては、下記の一般式（ＩＩ）で表される化
合物を挙げることができる。
【００３５】
【化５】
【００３６】（但し、Ｒ21は置換基を有していてもよい
アルキル基を表わし、そしてＱ-はアニオンを表わ
す。）
一般式（ＩＩ）において、Ｒ21は置換されていてもよい
炭素数１〜８のアルキル基が一般的であり、無置換の炭
素数１〜６のアルキル基が好ましい。アルキル基の置換
基としては、ハロゲン原子（例、Ｆ，Ｃｌ）、アルコキ
シ基（例、メトキシ、エトキシ）、アルキルチオ基
（例、メチルチオ、エチルチオ）、アシル基（例、アセ
チル、プロピオニル）、アシルオキシ基（例、アセトキ
シ、プロピオニルオキシ）、ヒドロキシ基、アルコキシ
カルボニル基（例、メトキシカルボニル、エトキシカル
ボニル）、アルケニル基（例、ビニル）、アリール基
（例、フェニル、ナフチル）を挙げることができる。こ
れらの中で、ハロゲン原子、アルコキシ基、アルキルチ
オ基、アルコキシカルボニル基が好ましい。Ｑ-のアニ
オンの好ましい例としては、ＣｌＯ4 -、ＡｓＦ6 -、ＢＦ
4 -、およびＳｂＦ6 -を挙げることができる。
【００３７】一般式（ＩＩ）で表される化合物例を表１
に記載する。
【００３８】
【表１】
【００３９】前記一重項酸素クエンチャーなどの褪色防
止剤の使用量は、色素（本発明における化合物）の量に
対して、通常０．１〜５０質量％の範囲であり、好まし
くは、０．５〜４５質量％の範囲、更に好ましくは、３
〜４０質量％の範囲、特に好ましくは５〜２５質量％の
範囲である。
【００４０】記録層の上には、記録層などを物理的およ
び化学的に保護する目的でカバー層を設けることが好ま
しい。カバー層は、透明な材質であれば特に限定されな
いが、光情報記録媒体内部への水分の侵入を防ぐ観点か
ら、ポリカーボネート、三酢酸セルロース等が好まし
く、さらに好ましくは、２３℃ＲＨ５０％での吸湿率が
５％以下の材料である。なお、「透明」とは、記録光お
よび再生光の光に対して、該光を透過する（透過率：９
０％以上）ほどに透明であることを意味する。
【００４１】カバー層は、接着剤からなる接着層を介し
て形成することができる。具体的には、接着層を構成す
る光硬化性樹脂を適当な溶剤に溶解して塗布液を調製し
た後、この塗布液を所定温度で記録層上に塗布して塗布
膜を形成し、該塗布膜上に、例えばプラスチックの押出
加工で得られた三酢酸セルロースフィルム（ＴＡＣフィ
ルム）をラミネートし、ラミネートしたＴＡＣフィルム
の上から光を照射して塗布膜を硬化させて、形成され
る。前記ＴＡＣフィルムとしては、紫外線吸収剤を含む
ものが好ましい。カバー層の厚さは、０．０１〜０．２
ｍｍの範囲であり、好ましくは０．０３〜０．１ｍｍの
範囲、より好ましくは０．０５〜０．０９５ｍｍの範囲
である。
【００４２】粘度制御のため、塗布温度は２３〜５０℃
の範囲が好ましく、２４〜４０℃の範囲がより好まし
く、２５〜３７℃の範囲がさらに好ましい。ディスクの
反りを防止するため、塗布膜への紫外線等の光の照射は
パルス型の光照射器（好ましくは、パルスの間隔がｍｓ
ｅｃ以下のＵＶ照射器、さらに好ましくはパルスの間隔
がμｓｅｃ以下のＵＶ照射器）を用いて行うのが好まし
い。パルス間隔はｍｓｅｃ以下が好ましく、μｓｅｃ以
下がより好ましい。１パルスの照射光量は特に制限され
ないが、３ｋＷ／ｃｍ2以下が好ましく、２ｋＷ／ｃｍ2
以下がより好ましい。照射回数は特に限定しないが、好
ましくは２０回以下、更に好ましくは１０回以下であ
る。
【００４３】以上の工程により、基板上に、光反射層、
記録層そしてカバー層が設けられた光情報記録媒体を製
造することができる。
【００４４】本発明の光情報記録媒体への記録方法は、
該光情報記録媒体を用いて、例えば、次のように行れ
る。まず光情報記録媒体を定線速度または定角速度にて
回転させながら、基板側あるいはカバー層側から半導体
レーザなどの記録用の光を照射する。この光の照射によ
り、記録層がその光を吸収して局所的に温度上昇し、物
理的あるいは化学的変化（例えば、ピットの生成）が生
じてその光学的特性を変えることにより、情報が記録さ
れると考えられる。本発明においては、記録光源とし
て、３８０〜５００ｎｍの範囲の発振波長を有する半導
体レーザを用いれば良い。
【００４５】３８０〜５００ｎｍの範囲の発振波長を有
するレーザ光源としては、３９０〜４１５ｎｍの範囲の
発振波長を有する青色系半導体レーザ、中心発振波長５
１５ｎｍの青緑色半導体レーザ、中心発振波長８５０ｎ
ｍの赤外半導体レーザと光導波路型の波長変換素子（Ｓ
ＨＧ）とから構成される中心発振波長４２５ｎｍの青紫
色ＳＨＧレーザを挙げることができる。記録密度の点で
青色系半導体レーザを用いることが特に好ましい。ま
た、記録密度を高めるために、ピックアップに使用され
る対物レンズのレンズ開口率（ＮＡ）は０．７以上であ
ることが好ましく、０．８５以上であることがより好ま
しい。
【００４６】なお、上記のように記録された情報の再生
は、光情報記録媒体を上記と同一の定線速度および定角
速度で回転させながらレーザ光を基板側あるいはカバー
層側から照射して、その反射光を検出することにより行
うことができる。
【００４７】本発明の光情報記録媒体は、従来のＤＶＤ
−Ｒと同様に、一定のトラックピッチのプレグルーブが
形成された透明な円盤状基板上に記録層および光反射層
が設けられてなる二枚の積層体をそれぞれの記録層が内
側となるように貼り合わせた構造とすることができる。
また、この積層体と同じ形状の円盤状保護基板とを記録
層を内側にして貼り合わせた構造としてもよい。なお、
貼り合わせ構造とする場合、例えば、透明基板の直径が
１２０±３ｍｍで厚みが０．６±０．１ｍｍのものが用
いられ、貼り合わせ後の光情報記録媒体の厚みが１．２
±０．２ｍｍとなるように調整される。この貼り合わせ
は、カバー層の形成に用いたＵＶ硬化性樹脂を用いて行
ってもよいし、合成接着剤を用いて行ってもよい。ま
た、両面テープで貼り合わせることもできる。
【００４８】
【実施例】次に、実施例により本発明を更に詳細に説明
するが、本発明は以下の実施例に限定されるものではな
い。
【００４９】［実施例１］厚さ１．１ｍｍ、直径１２０
ｍｍのスパイラル状のグルーブ（トラックピッチ３４０
ｎｍ，溝探さ２０ｎｍ，溝幅１６０ｎｍ）を有する射出
成形ポリカーボネート樹脂（帝人社製ポリカーボネー
ト、商品名：パンライトＡＤ５５０３）基板のグルーブ
を有する面上に、Ａｇをスパッタして１２０ｎｍの膜厚
の反射層を形成した。その後、一般式（Ｉ）で表される
化合物（上記例示化合物１）を乳酸メチル１％と混合
し、２時間超音波を用いて溶解し色素塗布液（濃度３
％）を調製した。この色素塗布液をスピンコー卜法によ
って回転数を３００ｒｐｍから４０００ｒｐｍまで変化
させながら２３℃５０％ＲＨの条件で膜厚が１０〜２０
０ｎｍになるように上記反射層上に塗布し記録層を形成
した。その後、２３℃５０％ＲＨ２時間でアニールを行
い、その後、ＺｎＳ−ＳｉＯ 2を５ｎｍの厚さでスパッ
タし、ＵＶ硬化接着剤（ＳＤ６６１ 大日本インキ社
製）を真空脱気泡６時間行い、その後スピンコート法に
よって外縁から３０ｍｍより内周に３０〜３００ｒｐｍ
で塗布し、厚さ８０μｍのポリカーボネートシート（ピ
ュアエース帝人社製）を重ね合わせ、その後３０ｒｐｍ
から８０００ｒｐｍまで変化させながら全面に接着剤を
広げた後、ＵＶ照射ランプにて紫外線を照射して硬化さ
せ、実施例１の光ディスクを作製した。
【００５０】［実施例２］実施例１において、一般式
（Ｉ）で表される化合物を上記例示化合物１から上記例
示化合物２に変更した以外は実施例１と同様にして実施
例２の光ディスクを作製した。
【００５１】［実施例３］厚さ１．１ｍｍ、直径１２ｍ
ｍのスパイラル状のグルーブ（トラックピッチ３４０ｎ
ｍ，溝深さ２０ｎｍ，溝幅１６０ｎｍ）を有する射出成
形ポリカーボネート樹脂（帝人社製ポリカーボネート、
商品名：パンライトＡＤ５５０３）基板のグループを有
する面上に、Ａｇをスパッタして１２０ｎｍの膜厚の反
射層を形成した。その後、一般式（Ｉ）で表される化合
物（上記例示化合物３）を膜厚が３０ｎｍ〜５０ｎｍと
なるように蒸着し、記録層を形成した。その後、２３℃
５０％ＲＨ２時間でアニールを行い、ＺｎＳ−ＳｉＯ2
を５ｎｍの厚さでスパッタした。次いで、ＵＶ硬化接着
剤（ＳＤ６６１ 大日本インキ社製）を真空脱気泡６時
間行い、その後スピンコート法によって３０ｍｍより内
周に３０〜３００ｒｐｍで塗布し、厚さ８０μｍのポリ
カーボネートシート（ピュアエース帝人社製）を重ね合
わせ、３０ｒｐｍから８０００ｒｐｍまで変化させなが
ら全面に接着剤を広げた後、ＵＶ照射ランプにて紫外線
を照射して硬化させ、実施例３の光ディスクを作製し
た。
【００５２】［実施例４〜６］実施例３において、一般
式（Ｉ）で表される化合物（上記例示化合物３）を、そ
れぞれ上記例示化合物４〜６に変更した以外は実施例３
と同様にして、実施例４〜６の光ディスクを作製した。
【００５３】［比較例１］実施例３において、一般式
（Ｉ）で表される化合物（上記例示化合物３）を、Ａｇ
ＩｎＳｂＴｅ（相変化無機材料）に変更し、スパッタに
より記録層を形成した以外は実施例３と同様にして、比
較例１の光ディスクを作製した。
【００５４】［光ディスクとしての評価１］作製した光
ディスクのそれぞれについて、４０５ｎｍのレーザーを
搭載したＤＤＵ−１０００（パルステック社製）を用い
て、未記録反射率と２Ｔ信号を記録し、Ｃ／Ｎを測定し
た。結果を表２に示す。尚、表２の記録層形成方法にお
いて、「Ａ」はスピンコート法を、「Ｂ」は蒸着法を表
す。
【００５５】
【表２】
【００５６】表２の結果から、本発明の特徴とする上記
一般式（Ｉ）で表される化合物を含有する記録層を有す
る光ディスク（実施例１〜６）は、ＡｇＩｎＳｂＴｅ
（相変化無機材料）を含む記録層を有する光ディスク
（比較例１）に比べて、波長４０５ｎｍのレーザ光に対
して高い反射率を示しことがわかる。また、Ｃ／Ｎも比
較例に比べて高いことがわかる。従って、本発明に従う
上記一般式（Ｉ）で表される化合物を用いることで、波
長３８０〜５００ｎｍの短波長レーザ光に対して高い記
録特性を具えた光ディスクが得られることがわかる。
【００５７】
【発明の効果】本発明の光情報記録媒体は、本発明にお
ける化合物を記録層の記録材料として用いることによ
り、波長３８０〜５００ｎｍの短波長のレーザ光、とり
わけ汎用性の高い波長４０５ｎｍ近辺のレーザ光を照射
して情報の高密度記録および再生が可能であり、かつ高
感度、高反射率、高変調度といった良好な記録再生特性
を有する、という効果を奏する。即ち、従来のＣＤ−Ｒ
やＤＶＤ−Ｒよりも高密度での情報の記録が可能とな
り、更に大容量の情報の記録が可能となる。DETAILED DESCRIPTION OF THE INVENTION
[0001]
The present invention relates to an optical information recording medium.
More specifically, information is recorded and recorded by laser irradiation.
Related to optical information recording media that can be reproduced
It is. In particular, a short wavelength laser with a wavelength of 380 to 500 nm
Heat mode suitable for recording information by light irradiation
The present invention relates to an optical information recording medium.
[0002]
2. Description of the Related Art Conventionally, one-time information is provided by a laser beam.
Known optical information recording media (optical discs)
It is. This optical disc is a write-once CD (so-called CD-
R), and its typical structure is a transparent disk-shaped substrate.
Recording layer made of organic dye on the plate, made of metal such as gold
A light reflecting layer and a protective layer made of resin are laminated in this order.
It is. And the recording of information on this CD-R
External laser beam (usually a laser with a wavelength around 780 nm)
Light) to the CD-R, and the recording layer
The irradiated part absorbs the light and the temperature rises locally.
By chemical or chemical changes (eg pit generation)
Information is recorded by changing the optical characteristics of the part.
It is. On the other hand, reading (reproducing) information is also possible for recording.
Irradiating the CD-R with laser light of the same wavelength as the laser beam
Where the optical properties of the recording layer have changed
(Recorded part) and unchanged part (unrecorded part)
This is done by detecting the difference in reflectance.
In recent years, optical information recording with higher recording density
A medium is sought. In addition to such requests
Type digital versatile disc (so-called DVD-
R) has been proposed (for example,
"Nikkei New Media" separate volume "DVD", 1995
line). This DVD-R is a track for the laser beam to be irradiated.
The guide groove for king is a half of CD-R
Formed with a narrow groove width of less than min (0.74-0.8μm)
Usually contains an organic dye on a transparent disc-shaped substrate.
A recording layer, a light reflection layer, and a protective layer were laminated in this order.
Two discs bonded together with the recording layers inside
Structure or disk-like protective group of the same shape as this disc
It has a structure in which the plates are bonded with the recording layer inside.
The Recording and playback of information on this DVD-R
Is visible laser light (usually from 630 nm to 680 nm
Is performed by irradiating laser light with a wavelength in the range)
Therefore, recording with higher density than CD-R is possible.
However, the recent Internet etc.
In addition to the rapid spread of networks and high-definition TV,
HDTV (High Definition Telephone)
vision) is about to start
Below, it is possible to record image information easily and inexpensively.
In addition, there is a need for a recording medium with a larger capacity.
The The above-mentioned DVD-R is currently a large capacity recording medium.
Although it plays a role as a body, it is more capable
The demand for higher volume and higher density is increasing.
It is also necessary to develop a recording medium that can meet the demand. others
Therefore, high-density recording with shorter wavelength light than DVD-R.
The development of higher-capacity recording media
It has been.
For example, Japanese Patent Laid-Open No. 4-74690,
Japanese Laid-Open Patent Publication No. 7-304256, Japanese Patent Laid-Open No. 7-304257
Gazette, JP-A-8-127174, 11-53.
758, 11-334204, 11-
No. 334205, No. 11-334206, No.
11-334207, JP-A 2000-43423
Publication No. 2000-108513 Publication No. 2000
-11504 gazette, 2000-149320 gazette
No. 2000-158818, and No. 200
0-228028 discloses a recording layer containing an organic dye.
An optical information recording medium having a light reflecting layer from the recording layer side
Irradiate a laser beam with a wavelength of 530 nm or less toward the side.
And a recording / reproducing method for recording and reproducing information.
It is disclosed. In these methods, porphyrin compounds
Products, azo dyes, metal azo dyes, quinophthalone colors
Element, trimethine cyanine dye, dicyanovinylphenyl
Skeletal dyes, coumarin compounds, naphthalocyanine compounds, etc.
On an optical disc having a recording layer containing a blue color (wavelength 4).
30nm, 488nm) or blue green (wavelength 515n
m) recording information by irradiating the laser beam;
Playback is in progress.
In addition, currently used CD-R systems.
From the viewpoint of compatibility with two different wavelength regions
An optical information recording medium that can be recorded and reproduced with laser light is also provided.
It has been proposed. For example, JP 2000-141900 A
Gazette, 2000-158816, 2000-
No. 185471, No. 2000-289342
No. 2000-309165 discloses a CD-R.
Mixing the dye used and the dye used in DVD-R
In the near infrared region around 780 nm.
Either laser light or visible laser light around 650 nm
Information recording that can be recorded and reproduced by laser light
Recording media have been proposed.
[0007]
SUMMARY OF THE INVENTION However, the present invention
According to the study of the optical disc described in the above publication,
For irradiation of short wavelength laser light with a wavelength of 380 to 500 nm
Sensitivity required for practical use when recording more information
Other, such as reflectance and modulation degree
The recording characteristics are not satisfactory, and further improvements are required.
Turned out to be. In particular, the optical device described in the above publication
The laser beam is irradiated with a laser beam having a wavelength of 380 to 500 nm.
The recording characteristics deteriorated.
The present invention has been made in view of the above problems of the prior art.
The object of the present invention is to provide a wavelength of 380 to 500.
nm short wavelength laser light, especially highly versatile wavelength 4
High-density recording of information by irradiating laser light around 05 nm
Can be reproduced and has excellent recording characteristics
It is to provide an information recording medium.
[0009]
[Means for Solving the Problems] To achieve the above object
Furthermore, the optical information recording medium of the present invention has a wavelength of 380 to 380 on the substrate.
Information can be recorded by irradiation with laser light of 500 nm.
Optical information recording medium having a suitable recording layer, the recording layer
Is a compound represented by the following general formula (I) (hereinafter referred to as “the present invention”).
In some cases. )
It is characterized by. The compound in the present invention has a wavelength of 340 nm.
It has an absorption band nearby. This compound in the present invention
By using it as a recording material for the recording layer, the wavelength is 380 to
High sensitivity to 500nm short wavelength laser
Good reflectivity and high modulation depth
An optical information recording medium having recording / reproduction characteristics can be obtained.
The
[0010]
[Chemical 2]
[Wherein R1To R6Each independently represents a hydrogen atom or
Represents a substituent, M represents a metal atom, and n represents an integer of 1 or more.
Represents. ]
In the above general formula (I), gold representing M
Genus is copper, nickel, iron, cobalt, palladium, mug
Nesium, aluminum, zinc, silicon, or rare earth elements
It is preferable that it is elemental. In addition, the substituent R1To R6But,
Alkyl group having 1 to 20 carbon atoms, 6 to carbon atoms
14 aryl groups, aralkyl having 7 to 15 carbon atoms
Group, a heterocyclic group having 1 to 10 carbon atoms, 1 carbon atom
To 20 alkoxy groups, 6 to 14 carbon atoms
Oxy group, acyl group having 2 to 21 carbon atoms, carbon
1-20 alkylsulfonyl groups, 6 carbon atoms
14 to 14 arylsulfonyl groups, 1 to 2 carbon atoms
5 carbamoyl groups, sulfa having 0 to 32 carbon atoms
Moyl group, alkoxycarbon having 1 to 20 carbon atoms
Group, aryloxycarboni having 7 to 15 carbon atoms
Group, acylamino group having 2 to 21 carbon atoms, amino
Groups, sulfonylalkylamino having 1 to 20 carbon atoms
Groups, sulfonylarylamino having 6 to 14 carbon atoms
Group, sulfonylamino group, or halogen atom.
And are preferred. N is an integer of 1 to 4.
preferable.
The optical information recording medium of the present invention comprises a substrate and a recording layer.
A light reflection layer made of metal between
Preferably, a cover layer for protecting the recording layer is further provided on the recording layer.
It is more preferable to prepare for. Also, the recording layer of the substrate
Is provided on the surface on which the track pitch is 0.2 to
It is preferable that a 0.5 μm pregroove is formed.
That's right.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an optical information recording medium of the present invention will be described.
The embodiment will be described in detail.
The optical information recording medium of the present invention has a label on a substrate.
It has a recording layer that can record information by irradiation of the light
An optical information recording medium, wherein the recording layer has the following general formula (I)
It contains the compound represented by these, It is characterized by the above-mentioned.
[0015]
[Chemical Formula 3]
[Wherein R1To R6Each independently represents a hydrogen atom or
Represents a substituent, M represents a metal atom, and n represents an integer of 1 or more.
Represents. ]
In the general formula (I), R1To R6Represented by
Preferred examples of the substituent include 1 to 2 carbon atoms.
An alkyl group of 0, an aryl group of 6 to 14 carbon atoms,
Aralkyl group having 7 to 15 carbon atoms, 1 carbon atom
Up to 10 heterocyclic groups, alkoxy having 1 to 20 carbon atoms
Si group, aryloxy group having 6 to 14 carbon atoms, carbon
Acyl group having 2 to 21 atoms, 1 to 20 carbon atoms
Alkylsulfonyl group, aryl having 6 to 14 carbon atoms
Sulfonyl group, carbamoyl having 1 to 25 carbon atoms
Group, sulfamoyl group having 0 to 32 carbon atoms, carbon atom
1 to 20 alkoxycarbonyl groups, carbon atoms
7-15 aryloxycarbonyl groups, carbon atoms
2 to 21 acylamino groups, amino groups, 1 carbon atom
To 20 sulfonylalkylamino groups, 6 carbon atoms
To 14 sulfonylarylamino groups, sulfonyla
A mino group or a halogen atom can be mentioned. R
1To R6As preferred, hydrogen atom, alkyl
Group, aryl group, alkoxy group, alkoxycarbonyl
Group, alkylsulfonyl group, acylamino group, amino group
Group, sulfonylamino group, particularly preferred
Is a hydrogen atom, alkyl group, alkoxy group, alkoxy
It is a carbonyl group.
In the general formula (I), the substituent R1To R6
May further have a substituent, and examples of the substituent include
Can include those described below.
A linear or cyclic chain having 1 to 20 carbon atoms
Alkyl groups (eg, methyl, ethyl, isopropyl,
Chloroyl), aryl groups having 6 to 18 carbon atoms (examples)
For example, phenyl, chlorophenyl, 2,4-di-t-a
Milphenyl, 1-naphthyl), 7 to 18 carbon atoms
Aralkyl groups (eg benzyl, anisyl), carbon atoms
Alkenyl groups having 2 to 20 molecules (for example, vinyl, 2-methyl
Tilvinyl), an alkynyl group having 2 to 20 carbon atoms (example:
For example, ethynyl, 2-methylethynyl, 2-phenylethyl
Tinyl), halogen atoms (eg, F, Cl, Br,
I), cyano group, hydroxyl group, carboxyl group, charcoal
An acyl group having 2 to 20 elemental atoms (for example, acetyl, ben
Zoyl, salicyloyl, pivaloyl), carbon atom number 1
20 alkoxy groups (eg, methoxy, butoxy,
Chlohexyloxy), aryl having 6 to 20 carbon atoms
Oxy groups (eg phenoxy, 1-naphthoxy, tolu
Oil), an alkylthio group having 1 to 20 carbon atoms (for example,
For example, methylthio, butylthio, benzylthio, 3-meth
Xylpropylthio), arylthio having 6 to 20 carbon atoms
O group (eg, phenylthio, 4-chlorophenylthio)
E) an alkylsulfonyl group having 1 to 20 carbon atoms (example:
For example, methanesulfonyl, butanesulfonyl), carbon source
Arylsulfonyl group having 6 to 20 children (for example, benze
Sulfonyl, paratoluenesulfonyl), carbon atoms
1 to 17 carbamoyl groups (for example, unsubstituted carbamoyl
Yl, methylcarbamoyl, ethylcarbamoyl, n-
Butylcarbamoyl, dimethylcarbamoyl), carbon source
Amide group having 1 to 16 molecules (for example, acetamide, ben
Zamide), acyloxy groups having 2 to 10 carbon atoms (examples)
Acetoxy, benzoyloxy), 2 carbon atoms
To 10 alkoxycarbonyl groups (e.g.
(Rubonyl, ethoxycarbonyl) 5 or 6 membered
Telocyclic groups (eg pyridyl, thienyl, furyl, thia
Aromatic hetero such as zolyl, imidazolyl, pyrazolyl
Ring, pyrrolidine ring, piperidine ring, morpholine ring, pyra
Ring, thiopyran ring, dioxane ring, dithiolane ring, etc.
Heterocycles), amino groups, and acylamino groups.
The
In the general formula (I), the substituent R1To R6
Preferred as a substituent for is an alkyl group or aryl
Group, alkoxy group, alkoxycarbonyl group, amino
Group, acylamino group, alkylsulfonyl group, sulfoni
A ruamino group, particularly preferred are alkoxy
Group, alkoxycarbonyl group, amino group, alkyl group
is there.
In general formula (I), n is preferably 1 to 3.
More preferably, 2 to 3 is preferable, and 3 is particularly preferable.
When n is an integer of 2 or more, a plurality of Rs may be the same as each other
Although it may differ, the case where it is the same is preferable. Ma
In general formula (I), M represents a metal atom,
Also copper, nickel, iron, cobalt, palladium, magnesi
Um, aluminum, zinc, silicon, or rare earth elements
preferable. Here, the rare earth element is scandium,
Yttrium, Lanthanum, Cerium, Praseodymium, Ne
Odymium, Promethium, Samarium, Europium, Ga
Dorinium, terbium, dysprosium, hormiu
, Erbium, thulium, ytterbium, lutetiu
Is a generic name for 17 elements of
Um, zinc, copper, nickel, iron, cobalt, palladium
Is preferred.
The compound according to the present invention is bonded at an arbitrary position.
May form a multimer, each unit in this case
May be the same or different from each other, and
, Polymethacrylate, polyvinyl alcohol, cell
It may be bonded to a polymer chain such as loin.
General used in the optical information recording medium of the present invention
The compound represented by the formula (I) is used alone as a specific derivative.
You can also mix different types of structures
Although it may be used, it is preferable to use it alone. still,
The compound in the present invention is unavoidable at the time of its synthesis.
With substituent R1To R6May contain substitutional isomers of
However, these substitutional position isomers are not distinguished from each other.
It can be regarded as a derivative. R1To R6Place of
Even if isomers are included in the substituent, these should be distinguished.
Can be regarded as the same compound in the present invention.
The Therefore, the case where the structure is different is explained by the general formula (I).
The substituent R1To R6The atomic species or number of
Or n is different.
In the following, preference of the compounds in the present invention
Specific examples (Exemplary Compounds 1 to 6) are shown below, but the present invention
Is not limited to these.
[0024]
[Formula 4]
The optical information recording medium of the present invention is formed on a substrate.
Especially if it has a recording layer containing the compound
There is no limit, and it can be applied to optical information recording media of various configurations.
You can. The optical information recording medium of the present invention is, for example,
Disc substrate with pre-groove of track pitch
It has a light reflection layer, recording layer, and cover layer in this order.
It can be set as a structure. Hereafter, light reflection on the disk-shaped substrate
Optical information having a projecting layer, a recording layer, and a cover layer in this order
Taking a recording medium as an example, optical information recording according to the manufacturing process
The configuration of the medium will be described in detail.
As a substrate, a substrate of a conventional optical information recording medium is used.
Select various materials used as plate materials.
Can be used. Specifically, glass; polycarbonate
-Acrylic trees such as Bonate and Polymethylmethacrylate
Fat; Vinyl chloride such as polyvinyl chloride and vinyl chloride copolymer
Resin; epoxy resin; amorphous polyolefin
Polyester; metal such as aluminum; etc.
These may be used together if desired. the above
Among materials, points such as moisture resistance, dimensional stability and low price
, Polycarbonate, amorphous polyolefin
Are preferred, and polycarbonate is particularly preferred. Also,
The thickness of the substrate is preferably 1.1 ± 0.3mm
Yes.
The substrate has a guide groove for tracking or
Concavities and convexities (pre-grooves) representing information such as address signals
Is formed. C to achieve higher recording density
Narrower track pitch than D-R and DVD-R
It is preferable to use a substrate with a pregroove of
Yes. Pregroove track pitch is 200-500
Preferably it is in the range of nm, more preferably
The range is 250 to 350 nm. Also pre-groove
The depth (groove depth) should be in the range of 20 to 150 nm.
And preferably, in the range of 50 to 120 nm
To do.
In the case where a light reflecting layer described later is provided.
The surface of the substrate on the light reflection phase side has improved flatness and adhesion.
For the purpose of improving, it is preferable to form an undercoat layer. The
As a material for the undercoat layer, for example, polymethyl methacrylate
, Acrylic acid / methacrylic acid copolymer, styrene
Maleic anhydride copolymer, polyvinyl alcohol, N-
Methylolacrylamide, styrene / vinyltoluene
Copolymer, chlorosulfonated polyethylene, nitrocell
Loin, polyvinyl chloride, chlorinated polyolefin, poly
Ester, polyimide, vinyl acetate / vinyl chloride copolymer
, Ethylene / vinyl acetate copolymer, polyethylene, polyethylene
Polymer materials such as polypropylene and polycarbonate;
Surface modification agents such as a coupling agent;
The For the undercoat layer, the above materials are dissolved or dispersed in a suitable solvent.
After preparing the coating solution, spin coating this coating solution,
Application methods such as dip coating and extrusion coating
Can be formed by applying to the substrate surface
Yes. The thickness of the undercoat layer is generally 0.005 to 20 μm.
In the range, preferably in the range of 0.01 to 10 μm.
The
The optical information recording medium of the present invention is provided with a light reflecting layer.
Preferably. The light reflecting layer is
A light reflective material having a high emissivity is used. The reflectance is
It is preferable that it is 70% or more. Reflective light reflection
As the substance, Mg, Se, Y, Ti, Zr, Hf,
V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe,
Co, Ni, Ru, Rh, Pd, Ir, Pt, Cu, A
g, Au, Zn, Cd, Al, Ga, In, Si, G
metals such as e, Te, Pb, Po, Sn, Bi, and semi-metal
Genus or stainless steel. these
These light-reflective materials may be used alone or in combination of two
You may use it in the above combination or as an alloy. this
Among these, preferred are Cr, Ni, Pt, Cu,
Ag, Au, Al and stainless steel. Especially preferred
Or Au, Ag, Al or alloys thereof.
Most preferably, Au, Ag or an alloy thereof
It is.
The light reflecting layer is made of, for example, the above light reflecting material.
Vapor deposition, sputtering or ion plating
Thus, it can be formed on the substrate. Light reflective layer
The layer thickness is generally in the range of 10-300 nm,
It is preferable to be in the range of ~ 200 nm.
The recording layer is formed by vapor deposition, sputtering,
Can be done by methods such as CVD or solvent coating
However, solvent coating or vapor deposition is preferred. By solvent application
When forming the recording layer, the compound of the present invention
In addition, if necessary, quencher, binder, etc.
Dissolve to prepare the coating solution, and then apply this coating solution to the substrate (light
If a reflective layer is provided, it is coated on the surface of the light reflective layer)
After forming, dry the formed coating film to form
Can do. Solvents for the coating solution include butyl acetate and lactic acid ester.
Esters such as chill and cellosolve acetate; methyl ester
Tyl ketone, cyclohexanone, methyl isobutyl keto
Ketones such as ethylene; dichloromethane, 1,2-dichloroe
Chlorinated hydrocarbons such as tan and chloroform;
Amides such as Lumamide; Methylcyclohexane etc.
Hydrocarbons: dibutyl ether, diethyl ether, tet
Ethers such as lahydrofuran and dioxane; ethanol
N-propanol, isopropanol, n-butano
Alcohol, diacetone alcohol and the like; 2,
Fluorine such as 2,3,3-tetrafluoropropanol
Solvents: ethylene glycol monomethyl ether, Eth
Lenglycol monoethyl ether, propylene glycol
Glycol ethers such as
Can be mentioned. The above solvent is used to dissolve the dye used.
Considering solveability alone or in combination of two or more
Can be used. Further oxidation prevention in coating solution
Various additives such as additives, UV absorbers, plasticizers and lubricants
You may add according to purpose.
As an example of a binder when a binder is used.
Gelatin, cellulose derivatives, dextran,
Natural organic polymer materials such as gin and rubber; and polyethylene
Len, polypropylene, polystyrene, polyisobutylene
Hydrocarbon resins such as polyvinyl chloride, polyvinyl chloride, polyvinyl chloride
Such as redene, polyvinyl chloride / polyvinyl acetate copolymer, etc.
Vinyl resin, polymethyl acrylate, polymethacryl
Acrylic resin such as methyl acid, polyvinyl alcohol, salt
Polyethylene, epoxy resin, butyral resin, rubber
Thermosetting of plastic derivatives, phenol / formaldehyde resins, etc.
List synthetic organic polymers such as precondensates of polymerizable resins
You can. When using a binder as the recording layer material
In addition, the amount of binder used is generally a dye (a compound in the present invention).
Range of 0.01 times to 50 times (mass ratio)
Preferably 0.1 times to 5 times (mass ratio)
Is in range. Dye in coating solution prepared in this way
Is generally in the range of 0.01 to 10% by weight,
Preferably it exists in the range of 0.1-5 mass%.
As the coating method, spray method, spin coating
Coating method, dipping method, roll coating method, blade coating
Law, doctor roll method, screen printing method, etc.
be able to. Application temperature is in the range of 23-50 ° C
If there is no particular problem, preferably at 24 to 40 ℃
Yes, 25-37 degreeC is still more preferable. Also, the above evaporation
Should be below the decomposition temperature by dielectric heating, preferably
Less than 400 ° C and the degree of vacuum is 10-3Less than mPa, more preferred
Or less than 300 ° C and the degree of vacuum is 10-FourmPa or less
The The recording layer may be a single layer or a multilayer. The thickness of the recording layer is one
Generally in the range of 20 to 500 nm, preferably 30 to
In the range of 300 nm, more preferably 50-100
It is in the range of nm.
The recording layer improves the light resistance of the recording layer.
Therefore, various anti-fading agents can be included.
As an anti-fading agent, a singlet oxygen quencher is generally used.
Is used. As a singlet oxygen quencher, already
Use known publications such as patent specifications.
You can. Specific examples thereof include JP-A-58-175.
693, 59-81194, 60-18387
No., No. 60-19586, No. 60-19586, No.
60-35054, 60-36190, 60-
No. 36191, No. 60-44554, No. 60-445
55, 60-44389, 60-44390
No. 60-54892, No. 60-47069, No.
63-209995, JP-A-4-25492, Japanese Patent
1-38680, 6-26028, etc.
Gazette, German Patent No. 350399, and Japanization
As described in the Journal of the October 1992 issue, page 1141, etc.
Can be mentioned. Preferred singlet oxygen quench
As an example of the charger, a compound represented by the following general formula (II)
Compound can be mentioned.
[0035]
[Chemical formula 5]
(However, Rtwenty oneMay have a substituent
Represents an alkyl group and Q-Represents an anion
The )
In general formula (II), Rtwenty oneMay be substituted
Alkyl groups having 1 to 8 carbon atoms are common and unsubstituted carbon
A prime number 1-6 alkyl group is preferred. Alkyl group substitution
Groups include halogen atoms (eg, F, Cl), alkoxy
Si group (eg, methoxy, ethoxy), alkylthio group
(Eg, methylthio, ethylthio), acyl group (eg, aceto
Til, propionyl), acyloxy groups (eg, acetoxy)
Si, propionyloxy), hydroxy group, alkoxy
A carbonyl group (eg, methoxycarbonyl, ethoxycal
Bonyl), alkenyl group (eg, vinyl), aryl group
(Eg, phenyl, naphthyl). This
Among them, a halogen atom, an alkoxy group, an alkyl group
O group and an alkoxycarbonyl group are preferable. Q-Ani
As a preferred example of ON, ClOFour -, AsF6 -, BF
Four -, And SbF6 -Can be mentioned.
Examples of compounds represented by the general formula (II) are shown in Table 1.
It describes.
[0038]
[Table 1]
Anti-fading such as the singlet oxygen quencher
The amount of the stopper used is the amount of the dye (the compound in the present invention).
On the other hand, it is usually in the range of 0.1 to 50% by mass, which is preferable.
Or in the range of 0.5 to 45 mass%, more preferably 3
In the range of ~ 40% by weight, particularly preferably 5-25% by weight.
It is a range.
On the recording layer, a recording layer is physically and physically disposed.
It is preferable to provide a cover layer for the purpose of chemical protection.
That's right. The cover layer is not particularly limited as long as it is a transparent material.
Is it a viewpoint to prevent moisture from entering the optical information recording medium?
Polycarbonate, cellulose triacetate, etc. are preferred
More preferably, the moisture absorption rate at 23 ° C. and RH 50% is
The material is 5% or less. “Transparent” means recording light
And the light of the reproduction light is transmitted (transmittance: 9
0% or more).
The cover layer passes through an adhesive layer made of an adhesive.
Can be formed. Specifically, the adhesive layer
Prepare a coating solution by dissolving the photocurable resin in a suitable solvent.
Then, apply this coating solution on the recording layer at a predetermined temperature.
A film is formed, and, for example, plastic is extruded onto the coated film.
Cellulose triacetate film (TAC film) obtained by processing
TAC film)
The coating film is cured by irradiating light from above.
The The TAC film includes an ultraviolet absorber.
Those are preferred. The thickness of the cover layer is 0.01-0.2
mm, preferably 0.03-0.1 mm
Range, more preferably 0.05 to 0.095 mm
It is.
The coating temperature is 23 to 50 ° C. for viscosity control.
Is preferable, and a range of 24 to 40 ° C. is more preferable.
Further, the range of 25 to 37 ° C is more preferable. Disc
In order to prevent warping, light such as ultraviolet rays is applied to the coating film.
Pulsed light irradiator (preferably the pulse interval is ms
ec UV irradiator, more preferably pulse interval
It is preferable to use a UV irradiator that is less than μsec)
Yes. The pulse interval is preferably msec or less, and μsec or less.
The lower is more preferable. The amount of light per pulse is particularly limited
No, but 3kW / cm2The following is preferred, 2 kW / cm2
The following is more preferable. The number of times of irradiation is not particularly limited,
Preferably it is 20 times or less, more preferably 10 times or less.
The
Through the above steps, the light reflecting layer,
An optical information recording medium provided with a recording layer and a cover layer is manufactured.
Can be built.
The recording method on the optical information recording medium of the present invention comprises:
For example, the optical information recording medium can be used as follows.
The First, the optical information recording medium is moved at a constant linear velocity or constant angular velocity.
While rotating, the semiconductor from the substrate side or cover layer side
Irradiate recording light such as laser. This light irradiation
The recording layer absorbs the light and the temperature rises locally.
There is a physical or chemical change (eg pit generation)
Information is recorded by changing its optical properties at the same time.
It is thought that. In the present invention, as a recording light source
A semiconductor having an oscillation wavelength in the range of 380 to 500 nm.
A body laser may be used.
It has an oscillation wavelength in the range of 380 to 500 nm.
As the laser light source to be used, the range of 390 to 415 nm
Blue semiconductor laser with oscillation wavelength, center oscillation wavelength 5
15nm blue-green semiconductor laser, center oscillation wavelength 850n
m Infrared Semiconductor Laser and Optical Waveguide Type Wavelength Conversion Element (S
HG) and a blue purple with a central oscillation wavelength of 425 nm
Mention may be made of color SHG lasers. In terms of recording density
It is particularly preferable to use a blue semiconductor laser. Ma
Used to pick up to increase recording density
The lens aperture ratio (NA) of the objective lens is 0.7 or more
Preferably 0.85 or more.
That's right.
Note that the information recorded as described above is reproduced.
Is the same constant linear velocity and constant angle as described above.
While rotating at a speed, the laser beam is on the substrate side or cover
By irradiating from the layer side and detecting the reflected light
I can.
The optical information recording medium of the present invention is a conventional DVD.
Like -R, a pre-groove with a constant track pitch
Recording layer and light reflecting layer on formed transparent disk-shaped substrate
Each of the recording layers is composed of two laminates.
It can be set as the structure bonded together so that it may become a side.
Also, record a disc-shaped protective substrate with the same shape as this laminate.
A structure in which the layers are attached to each other may be used. In addition,
In the case of a laminated structure, for example, the diameter of the transparent substrate is
For 120 ± 3mm and 0.6 ± 0.1mm thickness
The thickness of the optical information recording medium after bonding is 1.2.
It is adjusted to be ± 0.2 mm. This pasting
Is performed using the UV curable resin used to form the cover layer.
Alternatively, a synthetic adhesive may be used. Ma
It can also be bonded with double-sided tape.
[0048]
The following examples further illustrate the present invention.
However, the present invention is not limited to the following examples.
Yes.
[Example 1] Thickness 1.1 mm, diameter 120
mm spiral groove (track pitch 340
nm, groove search 20 nm, groove width 160 nm)
Molded polycarbonate resin (polycarbonate produced by Teijin Limited)
G, product name: Panlite AD5503) substrate groove
A film having a thickness of 120 nm is formed by sputtering Ag on the surface having
The reflective layer was formed. Then, represented by the general formula (I)
Compound (Exemplary Compound 1 above) mixed with 1% methyl lactate
And dissolved with an ultrasonic wave for 2 hours to prepare a dye coating solution (concentration 3).
%) Was prepared. This dye coating solution is applied by the spin coat method.
Change the rotation speed from 300rpm to 4000rpm
The film thickness is 10 to 20 under the condition of 23 ° C. and 50% RH.
A recording layer is formed by coating on the reflective layer so that the thickness is 0 nm.
did. Then, anneal at 23 ° C and 50% RH for 2 hours.
After that, ZnS-SiO 2With a thickness of 5 nm
UV curing adhesive (SD661 Dainippon Ink
Made by vacuum degassing for 6 hours, then spin coating
Therefore, from 30mm to 30mm from the outer edge to the inner circumference
Apply a polycarbonate sheet with a thickness of 80 μm
(Made by Ace Teijin)), then 30rpm
From 8000 rpm to 8000 rpm
After spreading, it is cured by irradiating ultraviolet rays with a UV irradiation lamp.
Thus, an optical disk of Example 1 was produced.
Example 2 In Example 1, the general formula
The compound represented by (I) is changed from the above exemplified compound 1 to the above example.
Executed in the same manner as in Example 1 except that it was changed to the indicated compound 2.
The optical disk of Example 2 was produced.
[Example 3] Thickness 1.1 mm, diameter 12 m
m spiral groove (track pitch 340n
m, groove depth 20 nm, groove width 160 nm)
Type polycarbonate resin (polycarbonate manufactured by Teijin Limited,
Product name: Panlite AD5503) Has board group
On the surface to be sputtered, Ag is sputtered to a thickness of 120 nm.
A spray layer was formed. Thereafter, the compound represented by the general formula (I)
Thickness of the product (Exemplified Compound 3) is 30 nm to 50 nm
Vapor deposition was performed to form a recording layer. Then 23 ° C
Annealing is performed at 50% RH for 2 hours, and ZnS-SiO2
Was sputtered with a thickness of 5 nm. Then UV curing adhesion
Agent (SD661, manufactured by Dainippon Ink, Ltd.), vacuum deaeration at 6 o'clock
Followed by spin coating to within 30mm
Polyurethane with a thickness of 80 μm is applied around 30-300 rpm
Overlapping carbonate sheets (Pure Ace Teijin Limited)
Change from 30 rpm to 8000 rpm
After spreading the adhesive on the entire surface, UV light is irradiated with a UV irradiation lamp.
To produce an optical disk of Example 3.
It was.
[Examples 4 to 6] In Example 3, general
The compound represented by the formula (I) (Exemplary Compound 3)
Example 3 except that each of the above exemplified compounds 4 to 6 was changed.
In the same manner, optical disks of Examples 4 to 6 were produced.
[Comparative Example 1] In Example 3, the general formula
The compound represented by (I) (Exemplary Compound 3) was converted to Ag.
Change to InSbTe (phase change inorganic material) for sputtering
In the same manner as in Example 3 except that the recording layer was formed, the ratio was
The optical disk of Comparative Example 1 was produced.
[Evaluation as an optical disk 1] Light produced
405nm laser for each disk
Using the mounted DDU-1000 (Pulstec)
Record the unrecorded reflectance and 2T signal and measure the C / N.
It was. The results are shown in Table 2. The recording layer forming method shown in Table 2
“A” represents the spin coating method and “B” represents the vapor deposition method.
The
[0055]
[Table 2]
From the results shown in Table 2, the above-described characteristics of the present invention are described.
Having a recording layer containing the compound represented by formula (I)
Optical discs (Examples 1 to 6) are made of AgInSbTe
Optical disc having a recording layer containing (phase change inorganic material)
Compared to (Comparative Example 1), the laser beam with a wavelength of 405 nm
It can be seen that high reflectance is exhibited. Also, C / N ratio
It can be seen that it is higher than the comparative example. Therefore, according to the present invention
By using the compound represented by the above general formula (I),
It is high for short wavelength laser light with a length of 380 to 500 nm.
It can be seen that an optical disc with recording characteristics can be obtained.
[0057]
The optical information recording medium of the present invention is suitable for the present invention.
Can be used as a recording material for the recording layer.
A short wavelength laser beam with a wavelength of 380 to 500 nm,
Irradiation of laser light with a wavelength of around 405 nm, which is highly versatile
High density recording and reproduction of information is possible and
Good recording / reproduction characteristics such as sensitivity, high reflectance, and high degree of modulation
It has the effect of having. That is, the conventional CD-R
Can record information at higher density than DVD and DVD-R
In addition, it is possible to record a larger amount of information.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H111 EA03 EA12 EA32 EA33 FA01 FA12 FA14 FB41 GA03 GA07 5D029 JA04 JB47 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 2H111 EA03 EA12 EA32 EA33 FA01 FA12 FA14 FB41 GA03 GA07 5D029 JA04 JB47
Claims (1)
ザ光の照射によって情報の記録が可能な記録層を有する
光情報記録媒体であって、該記録層は、下記一般式
（Ｉ）で表される化合物を含有することを特徴とする光
情報記録媒体。 【化１】 ［式中、Ｒ1乃至Ｒ6はそれぞれ独立して水素原子または
置換基を表し、Ｍは金属原子を表し、ｎは１以上の整数
を表す。］What is claimed is: 1. An optical information recording medium having a recording layer capable of recording information by irradiation with a laser beam having a wavelength of 380 to 500 nm on a substrate, wherein the recording layer has the following general formula: An optical information recording medium comprising the compound represented by (I). [Chemical 1] [Wherein, R 1 to R 6 each independently represent a hydrogen atom or a substituent, M represents a metal atom, and n represents an integer of 1 or more. ]
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002069580A JP3683862B2 (en) | 2002-03-14 | 2002-03-14 | Optical information recording medium |
| US10/383,580 US6800347B2 (en) | 2002-03-14 | 2003-03-10 | Optical information recording medium |
| DE60313689T DE60313689T2 (en) | 2002-03-14 | 2003-03-14 | Optical medium for recording information |
| EP03251562A EP1345217B1 (en) | 2002-03-14 | 2003-03-14 | Optical information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002069580A JP3683862B2 (en) | 2002-03-14 | 2002-03-14 | Optical information recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003266939A true JP2003266939A (en) | 2003-09-25 |
| JP3683862B2 JP3683862B2 (en) | 2005-08-17 |
Family
ID=27764526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002069580A Expired - Fee Related JP3683862B2 (en) | 2002-03-14 | 2002-03-14 | Optical information recording medium |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6800347B2 (en) |
| EP (1) | EP1345217B1 (en) |
| JP (1) | JP3683862B2 (en) |
| DE (1) | DE60313689T2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007321078A (en) * | 2006-06-01 | 2007-12-13 | Mitsubishi Chemicals Corp | Dye for forming recording layer of optical recording medium, optical recording medium using the same and method for recording of the same optical recording medium |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8293450B2 (en) * | 2006-11-28 | 2012-10-23 | Hewlett-Packard Development Company, L.P. | Laser imaging coating and methods for imaging |
| ITCS20110029A1 (en) * | 2011-10-03 | 2013-04-04 | Univ Calabria | ZERCO HETEROLEPTIC COMPLEXES (II) CONTAINING CURCUMINA AS ANTI-HUMAN AGENTS |
| CN105801608B (en) * | 2016-04-15 | 2017-12-22 | 阜阳师范学院 | A kind of novel rare-earth europium complex and preparation method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4003388B2 (en) * | 2000-10-17 | 2007-11-07 | コニカミノルタホールディングス株式会社 | Electroluminescence element and color conversion filter |
| JP4082872B2 (en) | 2001-02-21 | 2008-04-30 | 富士フイルム株式会社 | Optical information recording medium and optical information recording method |
| JP2002269821A (en) | 2001-03-06 | 2002-09-20 | Fuji Photo Film Co Ltd | Optical information recording medium |
-
2002
- 2002-03-14 JP JP2002069580A patent/JP3683862B2/en not_active Expired - Fee Related
-
2003
- 2003-03-10 US US10/383,580 patent/US6800347B2/en not_active Expired - Fee Related
- 2003-03-14 EP EP03251562A patent/EP1345217B1/en not_active Expired - Fee Related
- 2003-03-14 DE DE60313689T patent/DE60313689T2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007321078A (en) * | 2006-06-01 | 2007-12-13 | Mitsubishi Chemicals Corp | Dye for forming recording layer of optical recording medium, optical recording medium using the same and method for recording of the same optical recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| DE60313689D1 (en) | 2007-06-21 |
| EP1345217B1 (en) | 2007-05-09 |
| JP3683862B2 (en) | 2005-08-17 |
| US20030180496A1 (en) | 2003-09-25 |
| EP1345217A1 (en) | 2003-09-17 |
| DE60313689T2 (en) | 2007-10-18 |
| US6800347B2 (en) | 2004-10-05 |
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